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is a significant concern for physicians. Central
" @! g5 U. a9 K) o) i8 l) d; [precocious puberty (CPP), which is mediated( [: A: X# G, o* y
through the hypothalamic pituitary gonadal axis, has# P$ C! L+ [* U+ \& g
a higher incidence of organic central nervous system
5 S- g4 C1 e+ j }- Jlesions in boys.1,2 Virilization in boys, as manifested
' F/ m/ h! V5 Iby enlargement of the penis, development of pubic
$ W! O/ C, \7 }" Q& D4 s" |+ _hair, and facial acne without enlargement of testi-. j$ _- }6 A. o) W4 B! r
cles, suggests peripheral or pseudopuberty.1-3 We
" r$ j1 P& j9 Ereport a 16-month-old boy who presented with the/ X" y: D. M# B' S, q4 y$ ]
enlargement of the phallus and pubic hair develop-: r8 V3 C" b5 t
ment without testicular enlargement, which was due
9 }4 M/ a# U) @* D; }to the unintentional exposure to androgen gel used by
! C G+ X0 b; `- Qthe father. The family initially concealed this infor-! m! [7 o, u& Z; n& Y0 Q
mation, resulting in an extensive work-up for this3 h! b6 A- j! w' C
child. Given the widespread and easy availability of2 H3 x4 O. E1 E! `4 u. c3 [
testosterone gel and cream, we believe this is proba-, N. S- u3 Q- Q& r- ^
bly more common than the rare case report in the2 p% o8 Q! Q8 d# @& M. D: q
literature.4
+ C6 S8 I) a8 d z. j$ G0 A3 {Patient Report
3 O3 f }" D9 y7 E6 gA 16-month-old white child was referred to the
# a0 O5 C' [+ |7 B8 Fendocrine clinic by his pediatrician with the concern1 E4 F5 [7 e! P4 g
of early sexual development. His mother noticed
6 h5 q4 u9 e) k1 plight colored pubic hair development when he was+ @$ w% r$ ^* r- Q% Q
From the 1Division of Pediatric Endocrinology, 2University of
: F, x) E& x) L, q# N* S- \South Alabama Medical Center, Mobile, Alabama. q8 s R1 M/ r* P! M
Address correspondence to: Samar K. Bhowmick, MD, FACE,- a1 u/ ]) p) W, ^% o) b
Professor of Pediatrics, University of South Alabama, College of: M, c" F* z5 l: S
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;* }7 `1 R$ [) t! s# W A* f% d( r+ v
e-mail: [email protected]." M& K3 x7 B* l) d) W
about 6 to 7 months old, which progressively became
+ X! j7 `1 }6 z* A2 h( `$ H) pdarker. She was also concerned about the enlarge-
# r; U* S0 b9 f7 E/ kment of his penis and frequent erections. The child
0 _* d3 m& @ V7 F4 n: Jwas the product of a full-term normal delivery, with$ m% }. {7 g5 h! l/ B
a birth weight of 7 lb 14 oz, and birth length of
; c6 \* U# v c( P/ D1 a+ v20 inches. He was breast-fed throughout the first year
% q6 k- E1 l- h0 ]& i, ^# p5 aof life and was still receiving breast milk along with: i- U) I R$ B/ k' |$ R
solid food. He had no hospitalizations or surgery,
2 @5 L0 m2 r+ vand his psychosocial and psychomotor development, E4 |! J/ X' T' f
was age appropriate.
/ f( z. X$ N+ a( y/ `% kThe family history was remarkable for the father,
7 D9 S0 z' ^, ?% O) rwho was diagnosed with hypothyroidism at age 16,
b4 ]- P) u8 |* q; Uwhich was treated with thyroxine. The father’s
" A, p m* I# B3 {, [' Cheight was 6 feet, and he went through a somewhat
% z E% f3 K3 A4 Aearly puberty and had stopped growing by age 14.
( P5 g U$ j% q/ f- }+ N5 dThe father denied taking any other medication. The
' g6 G3 P! ~- y, m5 O+ M. }child’s mother was in good health. Her menarche9 V, `# r* B6 W2 S' o: q
was at 11 years of age, and her height was at 5 feet
; f5 e% n7 } s" w; I5 inches. There was no other family history of pre-
) ~% d; i* V6 }1 I; e( Icocious sexual development in the first-degree rela-( z4 k9 U7 t9 m6 t) w* F: l
tives. There were no siblings.) }7 i }# _6 V
Physical Examination1 c2 S% z. g( Y' W3 u- M
The physical examination revealed a very active,
: P0 z+ D( w% tplayful, and healthy boy. The vital signs documented
! z1 D: k4 q4 n+ m% pa blood pressure of 85/50 mm Hg, his length was& |' D5 I! F& u8 {
90 cm (>97th percentile), and his weight was 14.4 kg
1 t8 m( M- }) y% Z k, i(also >97th percentile). The observed yearly growth, Z5 u% v5 x- c9 q9 e9 y
velocity was 30 cm (12 inches). The examination of4 t3 g, I) V2 g. @1 E, Z6 l
the neck revealed no thyroid enlargement.
- c5 S) y5 u* SThe genitourinary examination was remarkable for+ O3 j& \( G! x
enlargement of the penis, with a stretched length of: P& I' X6 e7 N
8 cm and a width of 2 cm. The glans penis was very well: ?+ p* s) }# M
developed. The pubic hair was Tanner II, mostly around
1 r" ?! W* E) N2 ~* `" B5 w2 a1 G540
& I. G& t* g$ Q! n& pat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
! g4 @. F4 H( ?! h7 dthe base of the phallus and was dark and curled. The/ N" l2 Y- f& C, l% o0 |4 h" t5 l
testicular volume was prepubertal at 2 mL each.
6 q& Z+ W( d. {' S" H# [The skin was moist and smooth and somewhat6 K: g, B$ P8 J6 N& y# v+ M* _ Z
oily. No axillary hair was noted. There were no# L) T8 d6 r5 \8 `! J: P6 z
abnormal skin pigmentations or café-au-lait spots.
; R9 u, ?/ Z) ONeurologic evaluation showed deep tendon reflex 2+
3 p- W2 X3 {. C7 N4 w D) Lbilateral and symmetrical. There was no suggestion
/ |0 w( G6 G! p4 Eof papilledema.
1 z% V4 N- R) Q( YLaboratory Evaluation
0 k/ ^( N( `0 ~- tThe bone age was consistent with 28 months by4 E5 V6 F9 ?# d
using the standard of Greulich and Pyle at a chrono-" } ?& b! E; Q2 w
logic age of 16 months (advanced).5 Chromosomal( P8 u" }6 S' Y5 u' [ S! i
karyotype was 46XY. The thyroid function test$ N+ `$ G! B3 y4 R6 a- n
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
`, R# K! H0 S4 V7 hlating hormone level was 1.3 µIU/mL (both normal).
8 B& C% U5 ^, j: c1 G" Q$ ^% kThe concentrations of serum electrolytes, blood
* |* x5 Q5 s/ |9 Wurea nitrogen, creatinine, and calcium all were
1 P( g$ |: ^$ y+ I; h. l) j/ Swithin normal range for his age. The concentration$ K& M, {+ P, t
of serum 17-hydroxyprogesterone was 16 ng/dL) h' r, n |$ j0 F2 ?
(normal, 3 to 90 ng/dL), androstenedione was 205 y3 E1 w8 f7 V6 `
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
+ e7 b1 n7 { R; B3 G3 qterone was 38 ng/dL (normal, 50 to 760 ng/dL),
6 a4 L2 L+ r% {7 P/ I+ [desoxycorticosterone was 4.3 ng/dL (normal, 7 to
* w4 U. d% d% G% M9 o9 S- [+ M* T49ng/dL), 11-desoxycortisol (specific compound S)" ~$ i- c+ I6 n }
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
2 s& ?* ?* q7 _9 gtisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
* c8 f0 W3 V8 {6 p0 U7 jtestosterone was 60 ng/dL (normal <3 to 10 ng/dL),8 R1 Q& y- K- H6 M0 O
and β-human chorionic gonadotropin was less than! v5 S% e" I. z7 U1 W: b
5 mIU/mL (normal <5 mIU/mL). Serum follicular0 s) \* G e8 \* ]/ Y" M. s
stimulating hormone and leuteinizing hormone
; Q& [- E4 C, E( P5 aconcentrations were less than 0.05 mIU/mL% Y' _( n* ]1 \1 b" }
(prepubertal).
4 A$ W x1 w' LThe parents were notified about the laboratory4 {% |9 e3 i, m5 q- n/ t
results and were informed that all of the tests were
1 m G9 `+ o' a7 ~( z' Unormal except the testosterone level was high. The) c4 z- G3 L( n& S
follow-up visit was arranged within a few weeks to
" z4 q; ?9 G5 C# xobtain testicular and abdominal sonograms; how-5 B& f' R3 W L$ s/ W
ever, the family did not return for 4 months.
6 S6 {* K" J0 ?' k4 X( bPhysical examination at this time revealed that the/ l+ T( g9 {, {: M
child had grown 2.5 cm in 4 months and had gained
7 r) x7 a) `+ d& L" ]& B2 kg of weight. Physical examination remained
7 C7 j1 `8 j4 F& X9 T! ^& ~# f3 vunchanged. Surprisingly, the pubic hair almost com-1 S* F) w0 Y" N8 I; G, h) n
pletely disappeared except for a few vellous hairs at
% c& m" r5 x" p. c% Fthe base of the phallus. Testicular volume was still 29 @# P6 P1 s" u+ j9 [1 \
mL, and the size of the penis remained unchanged.
' a; K R) [7 A$ \The mother also said that the boy was no longer hav-
2 T3 x W, H# c4 Zing frequent erections.
: M; o% ]' J/ h. N* ]Both parents were again questioned about use of& A$ b5 h- R. x" ?% o3 z
any ointment/creams that they may have applied to' H- ~; ]. P) m* }6 N, t
the child’s skin. This time the father admitted the
2 \# P+ a2 L+ s8 eTopical Testosterone Exposure / Bhowmick et al 541
' v0 T: y6 |. a1 fuse of testosterone gel twice daily that he was apply-
9 b1 |6 ^7 M% D& T% ning over his own shoulders, chest, and back area for. `7 ~ M& D! U9 Z5 o! G
a year. The father also revealed he was embarrassed
8 P) @( F" d" M9 b- eto disclose that he was using a testosterone gel pre-
1 [/ o+ ^8 X9 Y- ]% H& g& B- t3 hscribed by his family physician for decreased libido
" n0 J6 `4 g+ O; @7 D1 w2 osecondary to depression.
$ g+ C2 u7 r4 N ZThe child slept in the same bed with parents.
+ q# Z$ u' e* R. Y+ AThe father would hug the baby and hold him on his
, S- z- R- [" E& h$ E9 a, w; g& a, tchest for a considerable period of time, causing sig-0 l6 X# K( p, S. S& ~+ u
nificant bare skin contact between baby and father.6 B0 _/ p$ K. X- D3 w* \. u1 r
The father also admitted that after the phone call,
6 ]" p1 b A9 lwhen he learned the testosterone level in the baby
9 w/ K0 W: a7 o1 u+ n. {was high, he then read the product information6 b4 Y4 w8 h2 b! e9 a- o
packet and concluded that it was most likely the rea-
: w) W- ~2 W: ~$ t" K4 Ison for the child’s virilization. At that time, they, O; \$ M( K* q) M0 n6 f0 y* T" F
decided to put the baby in a separate bed, and the% M {& T% l( N% s* O
father was not hugging him with bare skin and had& `* x6 p: F5 d3 g, d2 v' X9 w
been using protective clothing. A repeat testosterone4 W" Z! a9 _$ Z& _
test was ordered, but the family did not go to the
+ S, ]! S1 l. @& w7 @3 zlaboratory to obtain the test.
$ G. [- s, ], Z5 `5 H. G ?Discussion
" @: {3 }3 l8 V5 CPrecocious puberty in boys is defined as secondary: o) d4 z% p# u! H7 t
sexual development before 9 years of age.1,4
& H( C6 U( M3 |/ B3 u$ IPrecocious puberty is termed as central (true) when% w7 A5 _" h* N. K/ q k# |; Y! _
it is caused by the premature activation of hypo-( o( B8 C0 x4 Q) m1 R. g( q9 h
thalamic pituitary gonadal axis. CPP is more com-
: z3 N; C- s- }/ A$ A1 F6 ^mon in girls than in boys.1,3 Most boys with CPP
8 M b+ t! e/ W" x% Mmay have a central nervous system lesion that is
) ?7 b8 H. o& a) l% S& P2 ~responsible for the early activation of the hypothal-& c: }! `' @9 u7 l6 p+ o
amic pituitary gonadal axis.1-3 Thus, greater empha-$ Q! i/ V( Y; J$ g% ?0 {
sis has been given to neuroradiologic imaging in
: f3 x& u7 \1 W( B9 qboys with precocious puberty. In addition to viril-* B# G5 S+ f& f. ~8 \- ?
ization, the clinical hallmark of CPP is the symmet-
+ s6 N5 I2 k [" a7 A: D7 c- crical testicular growth secondary to stimulation by
. m/ D- } g2 A5 z9 ^7 m3 ~gonadotropins.1,3
( w& a3 J6 j3 O( z7 f4 {" sGonadotropin-independent peripheral preco-
9 t S, @! X( p+ ^( H1 }cious puberty in boys also results from inappropriate* G4 n/ @8 f( I
androgenic stimulation from either endogenous or, ^- ~, l0 u7 o' ]& \
exogenous sources, nonpituitary gonadotropin stim-
: }% K: i- {, i5 T2 j4 Bulation, and rare activating mutations.3 Virilizing8 I; O7 v2 P K1 T8 E
congenital adrenal hyperplasia producing excessive7 i$ ^9 X v/ }. Q- l
adrenal androgens is a common cause of precocious
3 Z+ q+ b/ `, [/ c+ [puberty in boys.3,4
, u* _4 Y- f8 i5 Q0 {6 tThe most common form of congenital adrenal
/ L0 J4 J; U7 N7 Y6 phyperplasia is the 21-hydroxylase enzyme deficiency.
! O, a- Y7 S6 S& AThe 11-β hydroxylase deficiency may also result in
; R" _& v4 q: Iexcessive adrenal androgen production, and rarely,
$ r3 Z- y+ Y7 Z D! i! r8 v: ^an adrenal tumor may also cause adrenal androgen7 H6 C3 o9 x7 }: E2 q0 Q7 k
excess.1,3
: v$ H& @- N+ x7 Zat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
: d! n* ~) {4 \# ^, ^4 `' z O542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
% D# k. O9 k6 V% ]. v' ~A unique entity of male-limited gonadotropin-
& H' d' _+ q; @* k$ r4 Vindependent precocious puberty, which is also known) ?) X$ F' T4 i) A r
as testotoxicosis, may cause precocious puberty at a+ j/ u* i, @3 i5 ^- L" P9 D, v+ j
very young age. The physical findings in these boys
+ Q. m" }3 C8 q8 fwith this disorder are full pubertal development,/ z" X9 Z0 y2 ]+ L0 h
including bilateral testicular growth, similar to boys
$ ]4 Y% b! k- Y+ s) W% E b& Cwith CPP. The gonadotropin levels in this disorder
' s% Z6 x4 x' R( ^( J! l7 `are suppressed to prepubertal levels and do not show
# Z3 O) X0 M0 b2 [ Upubertal response of gonadotropin after gonadotropin-
. P" K) r) Z% I( K7 vreleasing hormone stimulation. This is a sex-linked
0 X! \' E1 y* { d% v( oautosomal dominant disorder that affects only8 a& L) A' W4 s; w+ T1 R8 M
males; therefore, other male members of the family$ P# f: n+ E7 X1 ?9 i
may have similar precocious puberty.36 I9 Q: p# I6 l& ~* w b q. R2 a
In our patient, physical examination was incon-8 H. R9 t. C0 G. v& u( u
sistent with true precocious puberty since his testi-
, a2 i/ x! q% R- g1 ^' y3 o9 Qcles were prepubertal in size. However, testotoxicosis
8 X, B* ?" W# _: v7 `was in the differential diagnosis because his father& `. i4 u7 f. ~# u9 `& E
started puberty somewhat early, and occasionally,# Q3 G% [+ U) c8 r x
testicular enlargement is not that evident in the
3 f' q1 | Y% |+ ^beginning of this process.1 In the absence of a neg-
0 v2 M. L; A: Z9 Y( L7 ~ative initial history of androgen exposure, our' p. C$ [' E9 k/ Y) M" A. a# l
biggest concern was virilizing adrenal hyperplasia,
6 j& K0 G# y* q) Oeither 21-hydroxylase deficiency or 11-β hydroxylase! N* Q) ^; m( r- _) n. v6 @8 t3 g
deficiency. Those diagnoses were excluded by find-
1 [' t5 F: I0 \ l* k' ying the normal level of adrenal steroids.
; p( S* F X7 U. t6 H/ IThe diagnosis of exogenous androgens was strongly( B2 B, {9 J# j, p6 u7 @0 B6 ]! e6 ]
suspected in a follow-up visit after 4 months because
2 c' d( W$ T0 M( W; ythe physical examination revealed the complete disap-5 H9 m& T2 X* M4 Z9 ?* @
pearance of pubic hair, normal growth velocity, and, O4 `$ x4 s- E( S. `" q# E
decreased erections. The father admitted using a testos-% Z; e% E6 O, D7 h
terone gel, which he concealed at first visit. He was
* K, S( \* {5 w% pusing it rather frequently, twice a day. The Physicians’, h. X& e1 o; F; w9 v6 D( g
Desk Reference, or package insert of this product, gel or! I; x6 X9 Z) d' S1 r' Z, I+ n
cream, cautions about dermal testosterone transfer to. u% S0 C4 w9 D% o
unprotected females through direct skin exposure.
+ }( \1 B& P! C& vSerum testosterone level was found to be 2 times the* E* U* t. e: w8 W% F9 N! D. F" N( b6 h
baseline value in those females who were exposed to
& f v V; ]. d/ l- ieven 15 minutes of direct skin contact with their male2 M6 W% v; u+ Q" G+ h
partners.6 However, when a shirt covered the applica-9 D+ l9 o: }1 ?4 l! d# L
tion site, this testosterone transfer was prevented.
- S9 S+ i& U3 q0 Q0 m$ V7 GOur patient’s testosterone level was 60 ng/mL,
6 \# d( B, a* D, C" O# ]. Lwhich was clearly high. Some studies suggest that2 |/ ]8 |- Y" V }9 V7 k6 R# @
dermal conversion of testosterone to dihydrotestos-- ~; n$ _! ?6 J- F, c7 Q( ?
terone, which is a more potent metabolite, is more2 i" g% i; v- a6 p( h. N2 m
active in young children exposed to testosterone
+ Z5 S$ t2 H: ]5 m0 _ J4 z( [% o8 yexogenously7; however, we did not measure a dihy-
/ H7 l( e3 s1 g6 F! G6 u! Edrotestosterone level in our patient. In addition to
* w5 j9 O- ]8 B: p: j8 ~6 P# j( evirilization, exposure to exogenous testosterone in
3 {& R5 v- M2 r0 t: y3 u \/ {9 Tchildren results in an increase in growth velocity and. ~) m- ?* g- w" A3 _ a% E
advanced bone age, as seen in our patient.9 i9 p3 g/ ?7 E, Z. Y: L
The long-term effect of androgen exposure during
( ~/ H+ q2 E; f! W! w; v2 e+ c8 bearly childhood on pubertal development and final+ t3 h! G4 `( n, E( t
adult height are not fully known and always remain
$ B( o! g* G7 Sa concern. Children treated with short-term testos-
- X* v; Y, o! E6 Y Bterone injection or topical androgen may exhibit some3 J+ e. T! ?' k, c Q2 K7 Y* `( J
acceleration of the skeletal maturation; however, after$ B" o, p1 d2 V/ k
cessation of treatment, the rate of bone maturation e. ^* P& S) X' I6 V! Q
decelerates and gradually returns to normal.8,9
( a0 g8 q9 N& w5 y% w; DThere are conflicting reports and controversy g& |- l5 C$ R) k) F' X: @ @* `6 {$ ~
over the effect of early androgen exposure on adult
! g2 m# y6 C! l. b s: t# [& Xpenile length.10,11 Some reports suggest subnormal
+ u: a. K- K5 Eadult penile length, apparently because of downreg-* J. e/ S* X5 Z/ H
ulation of androgen receptor number.10,12 However,# l! }' G, S1 q/ R' L7 @
Sutherland et al13 did not find a correlation between! O* f( Z5 [, ? Z# ^, K
childhood testosterone exposure and reduced adult
! F( k6 b2 o5 Z [" u; b9 Fpenile length in clinical studies.# g% }5 c4 y( N& R2 Z t2 |
Nonetheless, we do not believe our patient is0 w$ ~' H7 e4 \0 O" m
going to experience any of the untoward effects from+ I" t9 a) `4 ]4 Q; t
testosterone exposure as mentioned earlier because2 `( _+ N5 i- ?* W& v
the exposure was not for a prolonged period of time.
H" e$ [: M, n3 Y. t1 }Although the bone age was advanced at the time of: j) ]$ N% g1 h! N, @+ M7 {
diagnosis, the child had a normal growth velocity at
+ S. r* l4 A: Rthe follow-up visit. It is hoped that his final adult
* f( U; g3 j1 n2 @; g! d& `6 Yheight will not be affected.
. D" M5 \. p v1 \1 qAlthough rarely reported, the widespread avail-: h6 V& B8 P7 y" X, W& P" |+ q( z
ability of androgen products in our society may
7 b7 T1 d8 j7 S& q& H5 dindeed cause more virilization in male or female
% W* ?' r( q: w7 ]7 f) Vchildren than one would realize. Exposure to andro-
: _/ D* ^3 u o- Sgen products must be considered and specific ques-3 C+ V" V4 }! X
tioning about the use of a testosterone product or9 l1 j. |) T% Q p: M
gel should be asked of the family members during2 O9 m4 q6 v. ^7 b* n% E- Z
the evaluation of any children who present with vir-
8 H3 Y: g3 J l7 o; n% g( p0 f1 k8 `ilization or peripheral precocious puberty. The diag-* Q- Z$ u' }/ |; E: ?( x" B. m
nosis can be established by just a few tests and by+ S' q8 {9 |0 N
appropriate history. The inability to obtain such a. U r( z: {+ `" B) K$ e" M; c' c
history, or failure to ask the specific questions, may4 u0 H1 j A ?9 z& P
result in extensive, unnecessary, and expensive5 |! o7 _5 s% a) {
investigation. The primary care physician should be
/ ^! M' }5 H( m- T# faware of this fact, because most of these children
3 B( h0 m( Z- q& U# zmay initially present in their practice. The Physicians’
9 `" m. b& m1 m) `Desk Reference and package insert should also put a) \0 F+ N- p, }$ u; p: _
warning about the virilizing effect on a male or
' \1 z2 m: A3 I' O8 [. u* Pfemale child who might come in contact with some-! ~1 {/ M8 w) B+ S$ o" {/ M
one using any of these products.7 x4 k% ~$ p' K. a E. F4 x) C* j
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5 I+ N! Z' u5 O+ f: Uand puberty in the male. In: Sperling MA, ed. Pediatric
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R9 Q3 j1 n, u, Y2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious. Z8 K: M0 s$ v" T1 i( S' t
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6. Physicians’ Desk Reference. Androgel 1% testosterone,
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; \ b% V& E6 sEconomics Company, Inc; 2004:3239-3241.
& X' D e5 F7 J0 R; P6 c4 }2 L7. Klugo RC, Cerny JC. Response of micropenis to topical
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